Armature brake



Jan. 17, 1939.

R. A. NEVINGER ARMATURE BRAKE Filed Feb. 2, 1958 Patented Jan. 17, 1939 UNETED STATES PATENT OFFICE ARMATURE BRAKE Ralph A. Nevinger, Greenville, Ill.

Application February 2, 1938, Serial No. 188,390

3 Claims. (01. 17236) This invention relates to clocks of the electrical by the reference character II is secured to the type, and more particularly to clocks or time arm [3 and is positioned over the shaft, providpieces designed for use where they must be freing a bearing for the arm I3. This arm I 3 is quently started and stopped, as is the clock formformed with a lower ofiset portion which is sup- 5, ing a part of the score board mechanism disclosed plied with strips of metal I! sensitive to the ac- 5 in my pending application filed July 2, 1935, tion of electric current passing through the field Serial Number 29,560. coils 8, so that when electric current passes The primary object of the invention is to prothrough the field coils, the lower end of the arm vide a stop or brake adapted to operate to im- [3 will be attracted. These strips of metal also mediately stop the hands of the clock when the provide means for weighting the arm, to normally 10 circuit to the clock motor has been broken. hold the arm in a. position as shown by Figure 3 Another important object of the invention is of the drawing. to provide a device of this character which may Extending through a threaded opening in the be readily and easily mounted on a clock frame arm I3, is a screw H), which is held within the of known construction, eliminating the necessity opening, against movement, by means of the lock 15 of providing auxiliary means or circuits for opernut It. This screw I5 is of a length to extend ating the braking means. into the casing in which the armature of the Still another object of the invention is to promotor operates, contacting with the armature, as vide a braking mechanism which will operate shown by Figure 3 of the drawing. Under nordirectly on the armature of the motor, the conmal conditions, that is when electric current is 20 struction of the brake being such as to include not passing through the field coils 8 of the elecfew parts, to the end that the cost of the upkeep tric motor, the pivoted arm l3 will move to cause of the mechanism will be exceptionally low. the screw [5 to contact the armature, preventing With the foregoing and other objects in View, rotary movement thereof. which will appear as the description proceeds, When the electric circuit to the motor is com- 25 the invention resides in the combination and pleted, the electric current passing through the arrangement of parts and in the details of confield coils of the motor, will attract the lower struction hereinafter described and claimed, it end of the pivoted arms I3, moving the screw being understood that changes in the precise em- I5 out of contact with the armature, and perbodiment of the invention herein described, may mitting the armature to rotate freely. It fol- 30 be made within the scope of what is claimed, lows that when the electric current has been out without departing from the spirit of the invenoff, the arm l3 will move the screw l5 into ention. gagement with the armature, stopping movement Referring to the drawing: thereof instantaneously with the stopping of the Figure 1 is a rear elevational view of an elecmotor. 5 trio clock, equipped with a braking device con- From the foregoing it will be seen that due to structed in accordance with the invention. the construction shown and described, the motor Figure 2 is a side elevational view thereof. which is controlled from a point remote from Figure 3 s a sectional v w through the m the clock mechanism, will also operate to control ture and r k device operating n oni n the braking mechanism, without the necessity of 40 tion t ew employing additional wiring, switches or the like, Referring t0 the drawing in detail, the referthe action of the brake being simultaneous with ence character 5 designates the casing of the the topping and starting of the clock motor.

usual electric Clock and as Shown the clock Having thus described the invention, What is mechanism includes a frame indicated generally claimed is: 45

by the reference character 6, which is secured The combination with the fi ld coils and t0 the real" Surface of the casing by means of armature of the motor of an electrical device, the bolts of a magnetic brake comprising a pivoted mem- Th frame 6 DYOVid-BS pp for the fieldber normally contacting with the armature, recoils 8 and armature 9 0f t e Cl mOtOI- stricting rotary movement of the armature, and 50 Secured to the frame 6, is an arm In, which said pivoted member adapted to be attracted by is formed with an opening to accommodate the the field coils of the electrical device when enershaft E2 on which the arm I3 is pivotally mountgized, moving the pivoted member out of engageed, the shaft l0 being provided with nuts ll, ment with the armature. I seeming the shaft in position. Asleeve indicated 2. The combination with the field coils and 55 armature of an electrical motor, of a magnetic brake comprising a pivoted arm, a weight on one end of the arm and disposed adjacent to a field coil of the motor, the weighted end of the arm being responsive to the action of electric current passing through the field coils, a member at the opposite end of the pivoted arm and adapted to engage the armature of the motor, restricting movement of the armature when the electric our- 10 rent to the motor is broken.

3. The combination with the field coils and 

